What was found
UPON LANDING IN PITTSBURGH, THE CREW REPORTED THAT THE NOSE GEAR ANNUNCIATOR DID NOT ILLUMINATE IN GEAR DOWN POSITION. THE BULB WAS THEN CHECKED WHICH WAS FOUND TO BE OKAY. THE CREW MANUALLY LOWERED THE GEAR PER THE CHECKLIST. THEN THEY DECLARED AN EMERGENCY LANDING IN PITTSBURGH WITHOUT INCIDENT. REMOVED AND REPLACED THE NOSE GEAR ACTUATOR / SWUNG GEAR. THE TEARDOWN REPORT REVEALED THAT THEY FOUND SWITCH WIRES BROKEN OFF AT SWITCH. CORROSION ON BARREL IS EXCESSIVE AND MUST BE REPLACED.